                    &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}&\multicolumn{1}{c}{(3)}&\multicolumn{1}{c}{(4)}&\multicolumn{1}{c}{(5)}\\
                    &\multicolumn{1}{c}{Heat pump}&\multicolumn{1}{c}{Electric}&\multicolumn{1}{c}{Natural gas}&\multicolumn{1}{c}{Heating oil}&\multicolumn{1}{c}{Propane}\\
\hline
ln(other cost) - ln(col. cost)&       0.101\sym{***}&      -0.085         &      -0.001         &      -0.005         &      -0.001         \\
                    &     (0.031)         &     (0.046)         &     (0.028)         &     (0.003)         &     (0.004)         \\
[1em]
\$30-59k             &      -0.011         &      -0.023         &       0.020         &       0.012         &      -0.001         \\
                    &     (0.012)         &     (0.017)         &     (0.018)         &     (0.008)         &     (0.009)         \\
[1em]
\$60-99k             &      -0.015         &      -0.002         &      -0.015         &       0.011         &       0.018         \\
                    &     (0.012)         &     (0.018)         &     (0.019)         &     (0.009)         &     (0.009)         \\
[1em]
\$100k+              &      -0.028\sym{*}  &       0.021         &      -0.014         &       0.003         &       0.018         \\
                    &     (0.013)         &     (0.017)         &     (0.019)         &     (0.009)         &     (0.010)         \\
[1em]
Black               &      -0.007         &       0.015         &      -0.022         &      -0.006         &       0.011         \\
                    &     (0.014)         &     (0.020)         &     (0.020)         &     (0.008)         &     (0.008)         \\
[1em]
Nat.Am.             &       0.004         &      -0.062         &      -0.022         &       0.012         &       0.052         \\
                    &     (0.055)         &     (0.074)         &     (0.072)         &     (0.013)         &     (0.028)         \\
[1em]
Asian               &       0.009         &      -0.035         &      -0.004         &      -0.001         &       0.015\sym{*}  \\
                    &     (0.017)         &     (0.030)         &     (0.033)         &     (0.012)         &     (0.007)         \\
[1em]
Other               &       0.008         &       0.057         &      -0.072         &      -0.007         &       0.010         \\
                    &     (0.022)         &     (0.036)         &     (0.037)         &     (0.015)         &     (0.015)         \\
[1em]
Owner               &      -0.056\sym{***}&      -0.011         &       0.083\sym{***}&      -0.004         &      -0.004         \\
                    &     (0.009)         &     (0.015)         &     (0.015)         &     (0.007)         &     (0.006)         \\
[1em]
Rural               &       0.034\sym{**} &       0.013         &      -0.064\sym{***}&       0.012         &       0.006         \\
                    &     (0.012)         &     (0.015)         &     (0.016)         &     (0.008)         &     (0.013)         \\
[1em]
Northeast           &       0.009         &       0.029\sym{*}  &       0.043\sym{*}  &      -0.085\sym{***}&       0.003         \\
                    &     (0.008)         &     (0.015)         &     (0.019)         &     (0.013)         &     (0.010)         \\
[1em]
South               &       0.050\sym{**} &      -0.086\sym{***}&       0.001         &      -0.005         &       0.006         \\
                    &     (0.019)         &     (0.019)         &     (0.019)         &     (0.005)         &     (0.011)         \\
[1em]
West                &      -0.016         &      -0.023         &       0.022         &      -0.005         &       0.004         \\
                    &     (0.012)         &     (0.016)         &     (0.018)         &     (0.005)         &     (0.011)         \\
[1em]
1950s               &       0.015         &      -0.032         &      -0.012         &       0.038\sym{**} &       0.004         \\
                    &     (0.012)         &     (0.018)         &     (0.023)         &     (0.014)         &     (0.009)         \\
[1em]
1960s               &       0.018         &      -0.058\sym{**} &       0.005         &       0.032\sym{*}  &       0.005         \\
                    &     (0.012)         &     (0.020)         &     (0.024)         &     (0.013)         &     (0.010)         \\
[1em]
1970s               &       0.018         &      -0.024         &      -0.014         &       0.040\sym{***}&      -0.010         \\
                    &     (0.012)         &     (0.019)         &     (0.022)         &     (0.012)         &     (0.010)         \\
[1em]
1980s               &       0.025         &      -0.056\sym{**} &      -0.006         &       0.053\sym{***}&      -0.016         \\
                    &     (0.014)         &     (0.020)         &     (0.022)         &     (0.011)         &     (0.012)         \\
[1em]
1990s               &       0.024         &      -0.073\sym{***}&       0.009         &       0.045\sym{***}&      -0.007         \\
                    &     (0.014)         &     (0.020)         &     (0.022)         &     (0.011)         &     (0.013)         \\
[1em]
2000s               &       0.021         &      -0.040\sym{*}  &      -0.051\sym{*}  &       0.057\sym{***}&       0.002         \\
                    &     (0.015)         &     (0.020)         &     (0.023)         &     (0.011)         &     (0.012)         \\
\hline
Observations        &       27307         &       27307         &       27307         &       27307         &       27307         \\
